My betta fish alex is doing alright until a few days ago. He had this plastic plant in his tank and I'm guessing he got scared swam into the plant and cut himself. Also I was noticing every now and then I see a piece of his tail at the bottom of his tank like it is faling out. Can you guys please help me. I was just going to get him a 5 gallon with a heater. He is right now in a 1 gallon with a lamp and I'm using " the hot water in a water bottle" to keep the water warm. I will post replies and show pictures of my fish. PLease tell me how I can help him!!!

I would keep the water conditions super clean to prevent any chance of bacterial infection. Perhaps you could try salt baths to help heal the wounds. I do salt dips, I have a quarantine tank to mix my salt bath in. 1 teaspoon of aquarium salt per gallon of water, I leave the betta in for 5 minutes then return it to the original tank. I usually treat them once for a wound caused by a plant etc just to prevent bacterial infections.

Make sure you dip water is the same temp as your tank water to prevent thermal shock to your betta. Use clean conditioned water for the salt dip, not water directly from the tank.

You should also remove your plastic plants from the tank to make sure you don't have fin rot on your hands rather then tearing from the plants. I would suggest a live plant, silk plants or non abrasive plastic plants for your new 5 gallon tank.

I agree with what was said above. You have to be careful about what plastic plants you use. A good way to test your plants is use a tissue or pantyhose and rub the plant against it, if it tears at all it can't be used.
I would definitely trash the one that hurt your betta. It is very likely that the plant is what tore his fins as well.

I'm sorry to say guys but Alex is doing a lot worse now. He is still swimming around. But he's a lot weaker. I also noticed his fins and they were as if shred apart. It's as if they are disintegrating. Is this fin-rot? Please tell me how to cure it!Thank you :D

Hrmmm fin rot can cause a fin to fall off in chunks, I had a betta who had it that bad. I used maracyn from the petstore to treat it and he is fine now. Some people go with salt baths before the medicine but his was really bad so I used the medicine right away. You have to be careful when you use it because it removes the oxygen from the water. Make sure your water is well aerated and that you give the correct dose. With maracyn you treat for 5 days...but the fin takes a really long time to grow back. It's been a couple of months and Ichigo's fins are not 100%grown back yet.